Test 2 Review (2007 Questions)

# Test 2 Review (2007 Questions) - 4 = 3353, h 5 = 3101, h 6...

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ME 221 APPLIED THERMODYNAMICS EXAM 2 13 November 2007 ____________________________________ NAME You may use the textbook, handouts, homework solutions, and your own notes. Please explain your solutions sufficiently for full credit. Q1 = 30%; Q2 = 35%, Q3 = 35% 1. On a particular day when the outside temperature is 2 ºC, a house requires a heat transfer rate of 10 kW to maintain the inside temperature at 22 ºC. An ideal vapor-compression heat pump with Refrigerant 134a as the working fluid is to be used. Specify appropriate evaporator and condenser pressures by assuming a temperature difference of 10 ºC between the refrigerant and the surroundings for effective heat transfer. Also, calculate the mass flow rate of refrigerant (kg/min), the compressor power (kW), and the coefficient of performance.

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2. The steady operation of a reheat-regenerative steam vapor power cycle is schematically illustrated below. Enthalpies (all in kJ/kg) at all conditions are given: h 1 = 3348, h 2 = 2963, h 3 = 2742, h
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Unformatted text preview: 4 = 3353, h 5 = 3101, h 6 = 2428, h 7 = 174, h 8 = 175, h 9 = 561, h 10 = 570, h 11 = 882, h 12 = 909, h 13 = 909. Assuming a total steam mass flow rate of 1 kg/s running through the cycle, calculate the mass flow rates of steam extracted from the turbine and diverted to the closed heater (y’) and to the open heater (y’’). Also, determine the cycle thermal efficiency if the net cycle power is known to be 1286 kW. 3. A moist air stream enters a steady-flow mixing chamber at state 1: 10 ºC, 10% relative humidity, and 1 m 3 /s volumetric flow rate. A second airflow also enters the unit at state 2: 20 ºC, 20% relative humidity, and 2 m 3 /s volumetric flow rate. After the mixing process, the mixture is then heated and added liquid water at 10 ºC at a rate of 200 kg/hr at state 3. A single flow exits the atmospheric-pressure a/c system at 40 ºC at state 4. Calculate the relative humidity of the exit flow at state 4 and the rate of heat transfer to the unit....
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## This note was uploaded on 02/01/2012 for the course MECH ENG 225 taught by Professor Koylu during the Spring '11 term at Missouri S&T.

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Test 2 Review (2007 Questions) - 4 = 3353, h 5 = 3101, h 6...

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